How to use forEach loop over Arrays in Javascript?

Question

I'm stuck on JavaScript basics, forEach looping over arrays. Can anyone explain me?

Divya · Accepted Answer

forEach method is used to run a function on every element present in an array. This method can only be used on Arrays, Maps and Sets.

You can either use callback functions or Arrow functions in forEach method.

Remember that you can not break, return or continue in forEach method like you do in traditional for loop. If you want to do so, then use exceptions in the call back function.

## forEach Syntax

```javascript
arrayname.forEach(function(err,doc){
    //code
});
```

## Example1 : Using Callback function

```javascript
const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = [];

numbers.forEach(function(ele){
  if(ele % 2 == 0)
    squaresOfEvenNumbers.push(ele*ele)
});

console.log(squaresOfEvenNumbers);
```
### click [here](https://onecompiler.com/javascript/3vgezuu4e) for results.

## Example2 : Using Arrow function

```javascript
const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = [];

numbers.forEach( ele => {if(ele % 2 == 0)
    squaresOfEvenNumbers.push(ele*ele)})

console.log(squaresOfEvenNumbers);
```
### click [here](https://onecompiler.com/javascript/3vges4e7w) for results.

How to use forEach loop over Arrays in Javascript?

1 Answer

forEach Syntax

Example1 : Using Callback function

click here for results.

Example2 : Using Arrow function

click here for results.